When you're evaluating a multifamily property, one of the most overlooked — yet most expensive — systems is the air conditioning equipment. Far too many investors walk into a deal focusing on rent rolls, cap rates, and cosmetic improvements, while ignoring the mechanical systems that quietly drain cash flow year after year. AC units are not optional comforts. They are critical infrastructure that directly impacts tenant satisfaction, retention, insurance claims, maintenance expenses, and long-term asset performance. This is why getting the accurate age of EVERY AC unit during due diligence is essential. 1. AC Units Have a Predictable Life Expectancy Most air conditioning systems in multifamily properties last: 10–12 years in Florida’s climate 8–10 years if poorly maintained Up to 15 years only if serviced consistently If you're buying a 100-unit property and 60 condensers are already past their life expectancy, you're staring at a six-figure capital expenditure over the next few years. Knowing the age lets you forecast actual CapEx, not guess. 2. Older Units Are Maintenance Magnets As AC units age, expect: More refrigerant leaks Failing capacitors and contactors Worn compressors Reduced cooling capacity Higher energy consumption Short cycling Older equipment doesn’t just fail more often — it costs you more every month in service calls and tenant complaints. A property with aging HVAC will quietly eat your NOI alive. 3. Insurance Companies Now Care About Mechanical Age In Florida, insurers are tightening underwriting on older AC systems due to: Fire risks from failing electrical components Water damage from clogged or failed drain pans Mold growth due to inadequate cooling Knowing the age upfront helps prevent surprises when your insurance carrier demands upgrades after closing. 4. The Age Can Affect Your Exit Strategy Buyers in 2025 and beyond are far more sophisticated. If half the AC units on your property are past life expectancy, the buyer will: